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Angle of elevation is the angle which line of sight makes with the horizontal. Angle of \( \mathrm{P} \) elevation of the top of a tall building is \( 30^{\circ} \) from W a place \( \mathrm{A} \) and becomes \( 60^{\circ} \) from another place \( B \) that is \( 10 \sqrt{3} \mathrm{~m} \) from A towards the building as shown in the figure. Height of the building is close to
(1) \( 7.5 \mathrm{~m} \)
(2) \( 10 \mathrm{~m} \)
(3) \( 12.5 \mathrm{~m}(4) 15 \mathrm{~m} \)
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